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.(No Model.)

H. U. SEAMAN. ENGRAVERS VISE.

WITNESESS:

Nrrnn STATES ATENT FFICE.

HOMER U. SEAMAN, OF XVASHINGTON, PENNSYLVANIA.

ENGRAVERS visE.

SPECIFICATION forming part of Letters Patent No. 420,970, dated February 11, 1890. Application led October 14, 1889. Serial No. 326,958. .(No model.)

To @ZZ whom it may concern:

Be it known that I, IfIOMER U. SEAMAN, a citizen of the United States, residing at Washington, in the county of Washington4 and State of Pennsylvania, have invented or discovered certain new and useful Improvements in Engravers Vises, of which improvement the following is a specification.

The invention described herein relates to certain improvements in work-holdersA or vises for jewelers and engravers, and has for its object such a construction of the clampingjaws and their adjusting mechanism as will permit of their easy removal for the substitution of others, and will insure a firm engagement with the adjusting mechanism when clamping the work.

The invention. claimed will be hereinafter more fully set forth.

In the accompanying drawings, forming a part of this specification, Figure l is a sectional elevation of the work-holder attached to an engravers block, which is shown in elevation. Fig. 2 is a top plan view of the work-holder, and Figs. 3 and 4f are plan views of jaws adapted for different kinds of work.

Through a circular disk 1,-which isiprovided on one side with a boss 2, having a tapering' hole 3 for the reception of the spindle 4. of the block 5 or the center-pin of a lathe, is formed a diametrical slot G, having its side walls undercut. In this slot is arranged the shaft 7, having' right and left hand threads out thereon, and journaled atl its ends in the filling-pieces S, secured in the ends of the slot, as shown. On the threaded portions of the shaft are placedcorrespondingly-threaded nuts or blocks lO, which are provided with stems 1l, projecting a suitable distance above the face of the disk l'. These stems are preferably made rectangular in crossdsection, so as to prevent any. rotation of the jaws l2, which are provided with similarly-shaped openings 13, for the reception of the stems.

It has been found impracticable to prevent the jaws from gradually working off the stems or tipping, thereby releasing the article held; hence small threaded pins have been formed on the stems and the jaws held in position by nuts or by shouldered screws passing through the jaws and screwing into the blocks or threaded nuts. rllhe removal and readjustmentof the nuts cause, however, considerable loss of time and annoyance through working loose and permitting the jaws to tip and release the work. In order to prevent any working off or tipping of the jaws, the stems ll are undercut on two opposite sides, as shown, thereby forming lips 14, which will project over the portions openings 13, thereby preventing slipping or tipping of the jaws, as will be readily understood.

In Fig. 1 the jaws are constructed to hold a watch-case, being provided with a groove adapted to engage the inwardly-projecting ledge formed around the inner edge of the case. The case is grasped by moving the jaws outwardly, and as the movement of the jaws is arrested bythe case the stems 1l will continue to move until the lipsloverlap the jaws, as shown in Fig. l, and thereby prevent the latter from Atipping or working oft the stems.

As shown in Figs. l and 2, the stems are provided with lips on opposite sides in order that they may engage the jaws whether moved outwardly, as described, to hold watchcases, or inwardly to grasp spoons or other articles, as shown in Fig. 2.

In order to prevent the stems from proj ecting above the jaws, the latter are made of a thickness greater than the length of the stems projecting above the surface of the disk l, and a countersink or recess is formed around the openings 13, so as to form ledges l5, with which the lips la may engage, as shown.

of the jaws adjacent to Vhile preferring to countersink the jaws, i

as stated, it will be understood that the stems may be made sufficiently long with reference to the thickness of the jaws that the lips 14 will overlap the upper surfaces of the jaws.

In Fig. 3 is shown one of a pair of jaws cond structed to grasp circular or rectangular disks, curved recesses 16 being formed at intervals around the jaws, which are also flattened and grooved at one point to grasp articles of irregular contour. In Figs. l and 4 are illustrated, as hereinbefore stated, jaws adapted to hold watch-cases, while in Fig. 2 are shown jaws constructed to hold spoons and like ar-` ticles.

It will be understood that while illustrating and describing generally jaws having differ?,y

IOO

ently shaped grasping portions I do not limit myself thereto, the invention herein relating more particularly to that construction of the jaws and their operating mechanism whereby said parts are easily and securely connected.

On one end of the shaft 7 is pivoted a handle 17, which, when not in use, may be turned down into a recess 18, formed in the periphery of the disk l, so as to be out of the Way.

Vhile showing the vise or Work-holder as mounted on an engravers block, it Will be understood that t-he vise may be used on a lathe or in any other suitable manner, and the blocks l0 may be shifted, one or both, in any other suitable manner than that shown.

I claim herein as my inventionl. In a vise or Work-holder, the combination of blocks movable with reference to each other, headed stems carried by said blocks, and jaws having openings of sueh size as to permit of the passage of the heads of the stems therethrough and held from vertical movement when in engagement With the article to be operated on by the heads of the stems, substantially as set forth.

2. In a vise or Work-holder, the Combination of a right and left hand threaded shaft, blocks or nuts mounted thereon, headed stems carried by said blocks, jaws having openings of such size as to permit of the passage of the heads of the stems therethrough and held from vertical movement when in engagement with the article to be operated on by the heads of the stems, substantially as set forth.

In a vise or Work-holder, the combination of blocks movable With reference to each other, headed stems carried by said blocks, and jaws having openings of such size as to permit of the passage of the heads of the stems therethrough and eountersunk around said openings, the ledges formed by the coun tersink passing under the heads of the stem, substantially as set forth.

In testimony whereof I have hereunto set my hand.

HOMER U. SEAMAN.

lVitnesses:

DARWIN S. WoLoo'rr, R. H. WHITTLESEY. 

